In his 1963 article, “Is Justified True Belief Knowledge?”1 Edmund Gettier devised a pair of counterexamples designed to illustrate that knowledge cannot be adequately defined as justified true belief. The basic idea behind both of his counterexamples is that one can be justified in believing a falsehood P from which one deduces a truth Q, in which case one has a justified true belief in Q but does not know Q. Gettier’s article inspired numerous other counterexamples, and the search was on for a fourth condition of knowledge, one that could be added to justification, truth, and belief to produce an adequate analysis of knowledge.